Next.js rewrites now use env vars (DATA_SERVICE_URL etc.) which point
to in-cluster services. Missing port caused rewrites to hit port 80
instead of 8000, breaking /api/data/* proxy (candles, orderbook).
- Add 'trading' managed role to siriusdevops-pgdb cluster
- Move trading-db-credentials from hermes-db to siriusdevops-db
- Create trading-data-db.yaml (Database kind) pointing to siriusdevops-pgdb
- Update DB_HOST in all 4 trading-platform configmaps to siriusdevops-pgdb-rw
- Remove trading-data-db.yaml and trading-db-credentials.yaml from hermes-db
- Update siriusdevops-db kustomization.yaml to include new resources